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Ame no Murakumo no Tsurugi (Sword of the Gathering Clouds of Heaven), also known as Kusanagi no Tsurugi (Grass-Cutting Sword), is a legendary black Japanese sword, and part of the Imperial Regalia of Japan. It was once the property of the former Heretic GodSusanoo and considered a demigod.

Susanoo loaned the sword to Ena, and after it was defeated by Godou, it became one of his belongings. However, Godou refused to use it as it would be illegal due to the Japanese weapon control laws. Godou has since gained the power to store it within his arm, and summon it upon command, but often loans it to Ena.

Ama no Murakumo no Tsurugi is a God of Steel and has shown the Authority of Wind and Storm control, and the ability to enhance the wielder to a point where they can surpass the abilities of a Great Knight. It can also possess its wielder when they are in the Netherworld. It's suggested that both of these require the power of Divine Possession to accomplish though.

Since being wielded by Godou, Ama no Murakumo has revealed the ability to copy Authorities used in it presence, or channel the Authorities of Godou, then manipulate the manifestation of this Authority. After absorbing the power of wind from the Authority of Luo Hao, it granted Godou the power of shockwaves from his punches, when adsorbing lightning created from Godou's Authority, it developed immense magnetic powers, and other abilities.

Ama no Murakumo has also shown the ability to penetrate spells, and disrupt curses, as when it broke through Keeper of the Horses to allow Godou to escape, and the power to transform into a giant warrior of great strength and precision.

Besides its Authority over weather, and embodying Steel, its full range of powers is unknown. However, Godou now has the ability to summon Ame no Murakumo no Tsurugi, though it is unknown what (if any) conditions are required to do this, and lend it to Ena. He has also learned how to lend Ena a copy of Ame no Murakumo no Tsurugi that will grant her as much power as the original did (suggesting she could only wield a fraction of the weapon's full power.)
Ame no Murakumo can communicate with Godou telepathically, revealing it to be alive and aware.
Ame no Murakumo no Tsurugi has the ability to adsorb divine powers directed at itself or its master, Godou. This allows it to take the power of an Authority that harms Godou and use it as a source of power, turning it against the enemy or, if desired, creating a new power from it. Another way of using it is to take the power of one of 'Godou's' Authorities, and use it to create a new power. In the case of the Goat Authority, with its power over lightning, it used it to create Magnetism powerful enough to hurl Sun Wukong into the uppermost reaches of the atmosphere.

Transformed Authorities:

Boar (Avatar of destruction) - Gives the Boar an armor of Steel and Sword Tusks that can be launched as projectiles.

Goat (Lightning) - Magnetism

Warrior (God-slaying sword) - Temporarily negate Divine Artifacts

Body of Steel - Constricting Circlet (Magic ring of metal that can bind even gods, no matter their strength)

Dragon's Roar and Tiger's Howl (Wind Manipulation) - Shockwave used to increase power of blows